make ListDetailsView two areas resizable

[ahmed-abdelrazek]

can i make the list to content areas in the ListDetailsView resizable by the user something like the grid GridSplitter

[michael-hawker]

It's not something we've thought of adding to the control itself. At that point it may make sense to have a customized experience.

We will have a control to help with this if you want to have the list area collapsible like VS Code's side bar (like I did in XAML Studio). That's the ContentSizer which is akin to a GridSplitter but more generalized for working if you don't have a grid. If you will always see both though, sure a Grid and a GridSplitter should work fine.

PR with that work is #4083, I hope to focus back on that in August, as I'd like to get it into 7.1